Review

Which is the best description of one particle of table salt (NaCl)?

• atom
• compound
• element

Tags

NGSS.MS-PS1-1

Which is the best example of a pure substance?

• peanuts
• milk
• gold
• air

How can mixtures best be described?

• made of one element
• made of different elements that are all chemically bonded together
• made of different elements that are not all chemically bonded together

Which chemical formula is an example of a compound?

• O₂
• 2Cl
• H₂SO₄

Tags

NGSS.MS-PS1-1

Why is carbon an element and not a compound?

• All carbon atoms have the same number of protons.
• Carbon bonds easily with oxygen, but not helium.
• Carbon is found in all living organisms.

Hydrogen peroxide (H₂O₂ ) and water (H₂O) both contain hydrogen(H) and oxygen (O). Why are they different compounds?

• Hydrogen peroxide contains one more oxygen than water.
• Hydrogen peroxide contains two more oxygens than water.
• Hydrogen peroxide contains one less oxygen than water.

Tags

NGSS.MS-PS1-1

Which is a mixture?

• H₂O
• salad
• table salt

Water (H₂O) and table salt (NaCl) can be combined to form salt water. How can this combination be classified?

• as a compound because the water (H₂O) and table salt (NaCl) arechemically combined
• as a compound because the water (H₂O) and table salt (NaCl) form anew pure substance
• as a mixture because the water (H₂O) can be evaporated andphysically separated from the table salt (NaCl)

Which substance is composed of only one type of atom?

• element
• mixture
• solution

How many elements are in one molecule of glucose (C₆H₁₂O₆ )?

• 1
• 3
• 6

Tags

NGSS.MS-PS1-1